The Mammoth Performance 240 is new and offers a deeper mattress than the standard 220 mattress as well as a deeper and more responsive sleep enjoyed by many top athletes . Purchasing the Mammoth Performance 240 firm feel mattress could be a life changing occasion as 71% of people who sleep on a mammoth mattress fall asleep quicker and sleep longer and this is in no way down to just the deep 22cm layer of posture cell medical grade foam . there are many other attributes that aid a comfortable and supportive sleep , a deeper 24cm mattress will help as offers 7% more efficent sleep that in turn gives you a more enjoyable sleep , It also offers a 100% hypoallergenic sleep with no bed bugs and has a High specification Tencel cooling fabric cover that is also removable for washing , when you add all these benefits up and marry it with a full 5 year guarantee and a 5 year warranty is it not time you tried a Mammoth Mattress.